Push button for a writing instrument



FIG. 1 is a perspective view of a writing instrument showing our new design;

FIG. 2 is a front view of the same FIG. 1;

FIG. 3 is a back view of the same FIG. 1;

FIG. 4 is a right side view of the same FIG. 1, the left side view being a mirror image of the right side view;

FIG. 5 is a top view of the same FIG. 1; and,

FIG. 6 is a bottom view of the same FIG. 1.

The broken lines shown in the drawings illustrate features of the article to which the design is applied that form no part of the claim.

The stippling represents contrast in material. 

We claim the ornamental design for a push button for a writing instrument, as shown and described. 